9x-120=5(x-8)解方程,9x-5x=-40+120这一步那下一步的得数应该是160,怎么会是80呢?
问题描述:
9x-120=5(x-8)解方程,
9x-5x=-40+120这一步那下一步的得数应该是160,怎么会是80呢?
答
20
答
9X-120=5(X-8)
9X-120=5X-40
9X-5X=120-40
4X=80
X=20
答
9x-120=5x-40
9x-5x=120-40
4x=80
x=20
答
9X-120=5X-40
9X-5X=-40+120
4X=80
X=20
答
9X-120=5X-40
9X-5X=120-40
4X=80
X=20
算这些题的时候要注意正负号!! 40前有个负号!
答
9x-120=5(x-8)
4x=80
x=20
答
9x-120=5(x-8)
9x-120=5x-40
9x-5x=-40+120
4x=80
x=20
答
9x-120=5x-40
4x=80
x=20